Protective mask



FIG. 1 is an isometric view of the protective mask.

FIG. 2 is a left side view of the protective mask.

FIG. 3 is a right side view of the protective mask.

FIG. 4 is a front view of the protective mask.

FIG. 5 is a top view of the protective mask.

FIG. 6 is a bottom view of the protective mask; and,

FIG. 7 is a back view of the protective mask.

The details shown in broken lines form no part of the claimed design.

I claim the ornamental design for a protective mask, as shown anddescribed.